Scattering Properties of PT-Symmetric Chiral Metamaterials

Round 1

Reviewer 1 Report

The authors of  the “scattering properties of parity-time chiral metamaterials”

Investigate theoretically the case of chiral metamaterials and demonstrated showing that mixing of chiral metamaterials with  Parity-Time-symmetric gain-loss enables a rather a plethora of phenomena and useful functionalities. 

They examine the case of a one-dimensional chiral parity-time symmetric crystal, and show that with normally incident waves the Parity Time-symmetric and the chirality-related features can be tuned independently as well superimposed at will. In addition under oblique incidence, chirality affects all the parity-time features, resulting in novel and uncommon wave propagation features, including asymmetric transmission, asymmetric optical activity, and ellipticity.

The article is well written, covering the well known by now legacy material for the sprawling parity-time literature sprinkled with detailed figures showing the author's ideas and extracted results for normal and oblique incidence.

Finally the authors state that the above physical effects may be employed in a wide range of technological applications, in particular in applications where advanced polarization control is required for example realizing, chiral unidirectional laser-absorbers and controllable polarization isolators. In this last section they may consider amplifying the discussion and compare the stated of the art with the “possible new” enabling materials as well as providing specific numbers and figures of merits for the improvement. In our view that will strengthen the message of the paper.

These results warrant publication of the article to the journal.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

My report is attached

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf